SECTION 23 6511
INDUCED DRAFT COOLING TOWERS - FIBERGLASS
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LANL MASTER SPECIFICATION
This template must be edited for each project. In doing so, specifier must add job-specific requirements. Brackets are used in the text to indicate designer choices or locations where text must be supplied by the designer. Once the choice is made or text supplied, remove the brackets. The specifications must also be edited to delete specification requirements for processes, items, or designs that are not included in the project -- and specifier’s notes such as these. To seek a variance from requirements in the specifications that are applicable, contact the Engineering Standards Manual MechanicalPOC. Please contact POC with suggestions for improvement as well.
When assembling a specification package, include applicable specifications from all Divisions, especially Division 1, General requirements.
Specification developed for ML-4 projects. For ML-1, 2, and 3 applications, additional requirements and independent reviews should be added if increased confidence in procurement or execution is desired; see ESM Chapter 1 Section Z10 Specifications and Quality sections.
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PART 1GENERAL
1.1SECTION INCLUDES
A.Factory fabricated induced draft cooling towers – fiberglass.
1.2PERFORMANCE REQUIREMENTS
A.Tower to operate at 7500 feet elevation.
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Comply with the ESM, Structural Chapter for site-specific seismic criteria.
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B.Tower assembly to comply with requirements of UBC seismic zone [2B] [4] construction.
C.Do not exceed the following sound pressure levels, measured at grade level 50 feet from the cooling tower.
1.Hz/dB: 63/75, 125/72, 250/75, 500/71, 1000/60, 2000/60, 4000/49, 8000/40.
2.Weighted average: 73dBA.
1.3SUBMITTALS
A.Submit the following in accordance with Section 013300, Submittal Procedures:
1.Catalog data.
2.Certifications that cooling tower performance, based on CTI 201, meets or exceeds specified requirements.
3.Installation instructions.
4.Performance curves for site specific data, plotting entering water temperature and leaving water temperature against wet bulb temperature.
5.Operations and maintenance data.
6.Warranties.
7.Shop drawings.
1.4QUALITY ASSURANCE
A.Manufacturer Qualifications: Company specializing in manufacturing the product specified in this section with minimum 5 years experience. The manufacturer must be a member of the Cooling Tower Institute.
B.Materials:
1.Flame spread/smoke developed rating of 25/50 or less in accordance with ASTM E84.
2.100 percent asbestos free.
1.5WARRANTY
A.Warrant the entire tower, including the motor, against failure due to defects in materials and workmanship for a period of 5 years following shipment to the site.
PART 2PRODUCTS
2.1PRODUCT OPTIONS AND SUBSTITUTIONS
A.Alternate products may be accepted; follow Section 01 2500, Substitution Procedures.
2.2MANUFACTURER
A.Marley Cooling Tower Co., Quadraflow Model [ ].
2.3PERFORMANCE
A.Capacity:
1.Btu/h: [ ].
2.Water Flow: [ ] gpm.
3.Entering Water Temperature: [ ] degrees F.
4.Leaving Water Temperature: [ ] degrees F.
5.Entering Design Air WB Temperature: [ ] degrees F.
2.4PHYSICAL DATA
A.Dry Weight: [ ] pounds.
B.Operating Weight: [ ] pounds.
C.Overall Dimensions: [ ] long, [ ] wide, [ ] high.
2.5MANUFACTURED UNIT
A.Provide unit for outdoor use, field erected, single cell, cross flow, vertical discharge, induced draft type, with motor.
B.Cooling Tower Construction: Inert fiberglass reinforced polyester (FRP) cold water basin, structural columns, hot water distribution basins, basin covers, top deck, fan cylinder, and access door.
C.Supporting Steel: Hot-dipped galvanized after welding, shipped together with tower.
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Motor selection is based on tower operation, e.g., tower operating during winter operation. Consult with tower manufacturer for motor selection. Size per ESM Mechanical Chapter D30GEN, Motors.
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D.Motor: Mounted outside of air stream, [2 speed, 1800/900 rpm], [single speed, 1800 rpm] [constant speed, 18000 rpm with VFD], totally enclosed fan cooled (TEFC). Comply with Section26 0700, Induction Motors-500HP and smaller.
1.[ ] hp.
2.[ ] volts, 3 phase, 60 Hz.
E.Fan: Multi blade, cast aluminum [some models may use glass reinforced epoxy (GRE) blades], manual adjustable pitch.
1.Fan Diameter: [ ] inches.
2.Air Flow: [ ] cfm.
F.Fan Drive: Right angle, industrial duty, oil lubricated, geared speed reducer equipped with an oil level sight-glass and drive shaft. Speed reducers employing sheaves and belts are not acceptable.
G.Fan Guard: One piece, welded steel rod and wire guard, hot dipped galvanized after fabrication.
H.Fill, Louvers, Drift Eliminators: 15 mil (0.015 inch) thick PVC fill sheet. Drift not to exceed 0.005 percent of circulated design gpm.
I.Hot Water Distribution System: Provide basin cover and orifice type inert polypropylene nozzles that are easily removable and replaceable. Provide top dual inlet connections per cell.
J.ColdWaterBasin: FRP basin with water level controller, integral sump with openings for supply, return (with strainer), overflow, make-up water, and drain. Provide [Side] [Bottom depressed] [Bottom] outlet connection.
K.Hardware (Nuts, Bolts, and Washers): Stainless steel.
L.Accessories:
1.Electric Immersion Heaters: In cold water basin, suitable to maintain basin water
temperature at 42 degrees F when outside temperature is minus 10 degrees F. Basin heater [ ] kW, [ ] volts, [ ] phase, 60 Hz.
2.Vibration Limit Switch: To break power circuit to fan motor in a situation of excess vibration, factory wired, manual re-set and field adjustable for sensitivity. Provide easy access to switch.
3.Water level controller: Flygt Multi-trode (MTR) level sensor, control relay (120 volts) and interconnecting cable shall be furnished and installed by the tower manufacturer. The relay shall provide a control voltage for a solenoid valve to fill the basin (high/low sensor) and contacts for a high level alarm. This unit replaces the float valve in the cold water basin.
4.Variable Frequency Drives (VFD)
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Consult with project electrical engineer and refer to the ESM Electrical Chapter for VFD requirements.
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PART 3EXECUTION
3.1INSTALLATION
A.Connect tower water supply and return piping to tower. Pitch tower water supply piping to tower and pitch tower water return piping away from tower.
B.Connect make-up piping with a valve connection to tower. Pitch piping to tower.
C.Connect overflow and drain piping to tower and route to floor drain. Provide an isolation valve in drain line.
3.2SUBCONTRACTOR’S FIELD SERVICES
A.Fill system with water. Notify LANL Subcontract Technical Representative (STR) immediately in the event of an accidental spill.
B.Check and fill gear drive with oil as recommended by manufacturer.
C.Rotate fan assembly and gear drive weekly from time of arrival to start-up.
D.Verify operation of water temperature controls.
3.3MANUFACTURER’S FIELD SERVICES
A.Check, test, and start-up tower in presence of LANL’s operating personnel.
B.Instruct the LANL’s operating personnel in operating and routine maintenance procedure. Schedule a minimum of 4 hours training during normal working hours.
END OF SECTION
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Do not delete the following reference information:
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FOR LANL USE ONLY
This project specification is based on LANL Master Specification 23 6511 Rev. 1, datedJune 11, 2008.
LANL Project I.D. [ ]Induced Draft Cooling Towers-Fiberglass
[Rev. 1,June 11, 2008]23 6511-1